Abstract: This paper takes the welded parts of thin-walled clutch hub of tractor transmission system as the research object.By designing special gear shaping fixture, heat treatment fixture and assembly press fixture, the precision of parts from finish turning gear blank to welding is strictly controlled.Using the process of spot welding, demagnetization and electron beam welding, the welding of finished parts is completed, the problem of welding deformation control of thin-walled parts is solved, and mass production is realized.